mailbox: qcom-ipcc: Reset CLEAR_ON_RECV_RD if set from boot firmware

mailbox: qcom-ipcc: Reset CLEAR_ON_RECV_RD if set from boot firmware

For some SoCs, boot firmware is using the same IPCC instance used
by Linux and it has kept CLEAR_ON_RECV_RD set which basically means
interrupt pending registers are cleared when RECV_ID is read and the
register automatically updates to the next pending interrupt/client
status based on priority.

Clear the CLEAR_ON_RECV_RD if it is set from the boot firmware.

Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>