configs: lx2160a: Remove unused Flexspi config options

It is now safe to remove Flexspi configs NXP_FSPI_FLASH_SIZE and
NXP_FSPI_FLASH_NUM options from headers as they are no longer used by
driver anymore.

Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

include/configs/lx2160a_common.h

@@ -154,12 +154,6 @@
 #endif
 #endif
 
-/* FlexSPI */
-#ifdef CONFIG_NXP_FSPI
-#define NXP_FSPI_FLASH_SIZE		SZ_64M
-#define NXP_FSPI_FLASH_NUM		1
-#endif
-
 /* GPIO */
 #ifdef CONFIG_DM_GPIO
 #ifndef CONFIG_MPC8XXX_GPIO