ti_armv7_common: env: Remove no longer needed mem_reserve

The kernel can now use DT to reserve memory carveouts and
these areas are now the default for drivers that need reserved
memory, so reserving more here is unneeded and any memory reserved
this way will be wasted.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>

include/configs/ti_armv7_keystone2.h

@@ -245,7 +245,6 @@
 	"tftp_root=/\0"							\
 	"nfs_root=/export\0"						\
 	"mem_lpae=1\0"							\
-	"mem_reserve=512M\0"						\
 	"addr_ubi=0x82000000\0"						\
 	"addr_secdb_key=0xc000000\0"					\
 	"name_kern=zImage\0"						\