LFU-544: Kconfig.nxp: Fixed secure boot on LS-CH2 platforms

pimg64 image pointer is dependent on ESBC_ADDR_64BIT config, which is
getting disabled, due to dependency on ESBC_HDR_LS.
ESBC_HDR_LS is required for LS-CH3 platforms.
So, removing the dependency on ESBC_HDR_LS.

Signed-off-by: Kshitiz Varshney <kshitiz.varshney@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Gaurav Jain <gaurav.jain@nxp.com>