ARM: dts: rp1: Adjust audio PLL frequencies

With the main audio PLL at 1.536GHz it is impossible to get I2S audio
at 384KHz with a frame length of 64 (32-bit stereo). Reducing it to
1.2288GHz makes it possible. This change is incompatible with a 192MHz
audio_sec PLL, so change this to 153.6MHz to make another set of
frequencies available.

See: raspberrypi#5743 (comment)

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

arch/arm/boot/dts/broadcom/rp1.dtsi

@@ -35,11 +35,11 @@
 					  <&rp1_clocks RP1_CLK_ETH_TSU>;
 
 			assigned-clock-rates = <1000000000>, // RP1_PLL_SYS_CORE
-					       <1536000000>, // RP1_PLL_AUDIO_CORE
+					       <1228800000>, // RP1_PLL_AUDIO_CORE
 					       <200000000>,  // RP1_PLL_SYS
 					       <125000000>,  // RP1_PLL_SYS_SEC
-					       <61440000>,   // RP1_PLL_AUDIO
-					       <192000000>,  // RP1_PLL_AUDIO_SEC
+					       <122880000>,  // RP1_PLL_AUDIO
+					       <153600000>,  // RP1_PLL_AUDIO_SEC
 					       <200000000>,  // RP1_CLK_SYS
 					       <100000000>,  // RP1_PLL_SYS_PRI_PH
 					       // Must match the XOSC frequency