configs: phycore_am62x_r5_defconfig: Increase SPL Malloc Pool

Increase the malloc pool size for the SPL by additional 4kB from
0x7000 to 0x8000.

This fixes following error message:
  ...
  alloc space exhausted ptr 7028 limit 7000
  DRAM init failed: -12

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
1 file changed