arm64: versal: Increase SYS_MALLOC_F_LEN

This patch increases SYS_MALLOC_F_LEN as the versal clock
driver needs to be probed before relocation itself inorder
to get required clocks before relocation.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>