Kconfig: Fix SYS_MALLOC_F_LEN for i.MX8MQ

i.MX8MQ use SYS_MALLOC_F_LEN 0x2000, not 0x10000. The OCRAM_S only has
32KB memory, use 0x10000 will make SPL not bootable.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>

Kconfig

@@ -250,9 +250,10 @@ config SYS_MALLOC_F_LEN
 	default 0x1000 if AM33XX
 	default 0x4000 if SANDBOX || RISCV
 	default 0x2000 if (ARCH_MX7 || ARCH_MX7ULP || ARCH_MX6 || ARCH_MX5 || \
-			   ARCH_QEMU || ARCH_SUNXI || ARCH_OWL)
-	default 0x10000 if (ARCH_IMX8 || ARCH_IMX8M || ARCH_LS1012A || \
-			    ARCH_LS1021A || ARCH_LS1043A || ARCH_LS1046A)
+			   ARCH_QEMU || ARCH_SUNXI || ARCH_OWL || IMX8MQ)
+	default 0x10000 if (ARCH_IMX8 || (ARCH_IMX8M && !IMX8MQ) || \
+			    ARCH_LS1012A || ARCH_LS1021A || ARCH_LS1043A || \
+			    ARCH_LS1046A)
 	default 0x400
 	help
 	  Before relocation, memory is very limited on many platforms. Still,