Synchronous channel command 48 needed to connect doorbell signal
after performing start channel operation to serve the doorbell
signal from gsi. Also ensure doorbell buffers are mapped after
doorbell connect cmd. Without this GSI FW corruptions seen
during q2spi sleep wakeup sequence.
Change-Id: Idf7a420e29eac3767d66492872d54c20bb657371
Signed-off-by: Chandana Kishori Chiluveru <quic_cchiluve@quicinc.com>