cpu: efm32_common: add emlib

cpu/efm32_common/emlib/ReadMe_emlib.txt

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+================ Silicon Labs Peripheral Library ============================
+
+This directory, "emlib", contains the Silicon Labs Peripheral Support
+library for the EFM32 and EZR32 series of microcontrollers and System-On-Chip
+devices.
+
+Some design guidelines for this library:
+
+* Follow the guidelines established by ARM's and Silicon Labs's adaptation
+  of the CMSIS (see below) standard.
+
+* Be usable as a starting point for developing richer, more target specific
+  functionality (i.e. copy and modify further).
+
+* Ability to be used as a standalone software component, to be used by other
+  drivers, that should cover "the most common cases".
+
+* Readability of the code and usability preferred before optimization for speed
+  and size or covering a particular "narrow" purpose.
+
+* As little "cross-dependency" between modules as possible, to enable users to
+  pick and choose what they want.
+
+================ About CMSIS ================================================
+
+These APIs are based on EM_CMSIS "Device" header file structure.
+
+As a result of this, the library requires basic C99-support. You might have
+to enable C99 support in your compiler. Comments are in doxygen compatible
+format.
+
+The EM_CMSIS library contains all peripheral module registers and bit field
+descriptors.
+
+To download EM_CMSIS, go to
+    http://www.silabs.com/support/pages/document-library.aspx?p=MCUs--32-bit
+
+For more information about CMSIS see
+    http://www.onarm.com
+    http://www.arm.com/products/CPUs/CMSIS.html
+
+The requirements for using CMSIS also apply to this package.
+
+================ File structure ==============================================
+
+inc/ - header files
+src/ - source files
+
+================ Licenses ====================================================
+
+See the top of each file for SW license. Basically you are free to use the
+Silicon Labs code for any project using Silicon Labs devices. Parts of the
+CMSIS library is copyrighted by ARM Inc. See "License.doc" for ARM's CMSIS
+license.
+
+================ Software updates ============================================
+
+Silicon Labs continually works to provide updated and improved emlib, example
+code and other software of use for Silicon Labs customers. Please check the
+download section of Silicon Labs's web site at
+
+        http://www.silabs.com
+
+for the latest releases. If you download and install the
+Simplicity Studio application, you will be notified about updates when
+available.
+
+(C) Copyright Silicon Labs, 2015