staging: gasket: apex: remove unused array cm_mappable_regions

Array cm_mappable_regions is defined but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: 'cm_mappable_regions' defined but not used [-Wunused-const-variable=]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gasket/apex_driver.c

@@ -138,9 +138,6 @@ static const struct gasket_mappable_region mappable_regions[NUM_REGIONS] = {
 	{ 0x48000, 0x1000 },
 };
 
-static const struct gasket_mappable_region cm_mappable_regions[1] = { { 0x0,
-	APEX_CH_MEM_BYTES } };
-
 /* Gasket device interrupts enums must be dense (i.e., no empty slots). */
 enum apex_interrupt {
 	APEX_INTERRUPT_INSTR_QUEUE = 0,