media: staging/ipu7: Fix the loop bound in l2 table alloc

media: staging/ipu7: Fix the loop bound in l2 table alloc

This patch fixes the incorrect loop bound in alloc_l2_pt(). When
initializing L2 page table entries, the loop was incorrectly using
ISP_L1PT_PTES instead of ISP_L2PT_PTES though the ISP_L1PT_PTES is
equal to ISP_L2PT_PTES.

Fixes: 71d81c25683a ("media: staging/ipu7: add IPU7 DMA APIs and MMU mapping")
Cc: stable@vger.kernel.org
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>