PCI: mobiveil: Mask out hardcoded bits in inbound/outbound windows setup

The lower 10 bits of window size field are hardcoded to zero in HW so
they can't really be changed but the lower 10-bit of PAB_AXI_AMAP_CTRL
register are used for control fields, so while programming inbound and
outbout windows decoding we should mask out the lower 10-bit of window
size to prevent overriding the control bits.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>
Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@mobiveil.co.in>