src: Match array format in function declarations and definitions

gcc 11.1 complains when we're passing a type* into a function that was
declared to get a type[], even if the ABI has identical parameter
passing for both.

To prepare for newer compilers, adapt to this added constraint.

Change-Id: I5a1b3824a85a178431177620c4c0d5fddc993b4f
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54094
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/skylake/lpc.c

@@ -14,7 +14,7 @@
 
 #include "chip.h"
 
-void soc_get_gen_io_dec_range(uint32_t *gen_io_dec)
+void soc_get_gen_io_dec_range(uint32_t gen_io_dec[LPC_NUM_GENERIC_IO_RANGES])
 {
 	const config_t *config = config_of_soc();