[TOPIC-GPIO] tests: gpio_api_1pin: fix port related testcases

[mnkp]

Keep promise of testing 1 pin only, don't attempt to test other pins when verifying gpio_port_* API functions.

Fixes: #19692

[zephyrbot]

All checks passed.

checkpatch (informational only, not a failure)

-:109: WARNING:LONG_LINE: line over 80 characters
#109: FILE: tests/drivers/gpio/gpio_api_1pin/src/test_port.c:182:
+		port_set_masked_raw_and_verify(port, BIT(TEST_PIN), test_vector[i], i);

-:135: WARNING:LONG_LINE: line over 80 characters
#135: FILE: tests/drivers/gpio/gpio_api_1pin/src/test_port.c:222:
+		port_set_masked_and_verify(port, BIT(TEST_PIN), test_vector[i], i);

-:163: WARNING:LONG_LINE: line over 80 characters
#163: FILE: tests/drivers/gpio/gpio_api_1pin/src/test_port.c:265:
+		port_set_masked_and_verify(port, BIT(TEST_PIN), test_vector[i], i);

-:177: WARNING:LONG_LINE: line over 80 characters
#177: FILE: tests/drivers/gpio/gpio_api_1pin/src/test_port.c:272:
+		port_set_masked_raw_and_verify(port, BIT(TEST_PIN), test_vector[i], i);

-:210: WARNING:LONG_LINE: line over 80 characters
#210: FILE: tests/drivers/gpio/gpio_api_1pin/src/test_port.c:316:
+		port_set_masked_and_verify(port, BIT(TEST_PIN), test_vector[i], i);

-:212: WARNING:LONG_LINE: line over 80 characters
#212: FILE: tests/drivers/gpio/gpio_api_1pin/src/test_port.c:318:
+		port_get_raw_and_verify(port, BIT(TEST_PIN), ~test_vector[i], i);

-:226: WARNING:LONG_LINE: line over 80 characters
#226: FILE: tests/drivers/gpio/gpio_api_1pin/src/test_port.c:323:
+		port_set_masked_raw_and_verify(port, BIT(TEST_PIN), test_vector[i], i);

- total: 0 errors, 7 warnings, 330 lines checked

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[pabigot]

This fixes the known problems on sx1509b though it specifies non-existent pins on that platform which produces a diagnostic.

All the 1 << pos expressions should be replaced by BIT(pos), since if TEST_PIN is ever 31 the code is subject to undefined behavior on a 32-bit system, but that's not a port-related problem.

[mnkp]

All the 1 << pos expressions should be replaced by BIT(pos)

Good point. Fixed.