msm_geni_serial: Add ioctl for adding new IPC log in uart

Add ioctl for adding new IPC log buffer in UART driver.
If BT host driver observes a fault in BT transfers this ioctl
needs to be called. On this ioctl call uart driver will change
the logging to new file so that the issue scenario
could be preserved in old UART IPC log files.

Change-Id: I0da719159d20f60602922f482467178d038b443c
Signed-off-by: Prudhvi Yarlagadda <pyarlaga@codeaurora.org>
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>