driver: net: fsl-mc: Use base 16 in simple_strtoul

Value provided in MC_MEM_SIZE_ENV_VAR is in hex. Use 16 as base
in simple_strtoul.

Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv8/fsl-layerscape/doc/README.lsch3

@@ -118,7 +118,7 @@ Environment Variables
 mcboottimeout:	MC boot timeout in milliseconds. If this variable is not defined
 		the value CONFIG_SYS_LS_MC_BOOT_TIMEOUT_MS will be assumed.
 
-mcmemsize:	MC DRAM block size. If this variable is not defined, the value
+mcmemsize:	MC DRAM block size in hex. If this variable is not defined, the value
 		CONFIG_SYS_LS_MC_DRAM_BLOCK_MIN_SIZE will be assumed.
 
 mcinitcmd:	This environment variable is defined to initiate MC and DPL deployment

drivers/net/fsl-mc/mc.c

@@ -826,7 +826,7 @@ unsigned long mc_get_dram_block_size(void)
 
 	if (dram_block_size_env_var) {
 		dram_block_size = simple_strtoul(dram_block_size_env_var, NULL,
-						 10);
+						 16);
 
 		if (dram_block_size < CONFIG_SYS_LS_MC_DRAM_BLOCK_MIN_SIZE) {
 			printf("fsl-mc: WARNING: Invalid value for \'"