armv8: ls1088a: qspi: Enable XIP mode above 16 MB addresses

Currently in LS1088A, XIP mode in QSPI works up to 16 MB
addresses. This patch enables QSPI support in XIP mode for
addresses above 16 MB as well.

Signed-off-by: Rajat Srivastava <rajat.srivastava@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>