pinctrl: imx27: Fix too generic defines

The "PC" define is colliding with the (apparently broadcased)
define for "program counter" on Loongarch, so let's rename all
these 2-letter defines so they don't collide with stuff.

Fixes: a55222b7 ("pinctrl: freescale: enable use with COMPILE_TEST")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202410030214.dPrgmUqd-lkp@intel.com/


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/20241003-fix-imx27-pc-v1-1-0e78d1fc6175@linaro.org