Disable interrupts when using DCC fifo to prevent deadlock if interrupt
occurs that causes a console write.
Bug: 175415911
Fixes: 61d87acb93 ("FROMLIST: hvc_dcc: bind driver to core0 for reads
and writes")
Change-Id: I645bafef1d8bc58ee93b086b46d822c046aece2d
Signed-off-by: Elliot Berman <eberman@codeaurora.org>