easelcomm: Reset cmdchan before sending bootstrap MSI

This patch adjusts the timing to make sure Easel side ringbuffer
is re-initialized before the bootstrap MSI is delivered to AP.

This fixes some issue that bootstrap MSI is delivered, but a clock
change request does not get its reply.

Also modifies easelcomm_cmd_channel_data_handler for more precise
error message.

Bug: 111061444
Change-Id: I59758fbf1c17039e20ade9c44314686d234b2f33
Signed-off-by: Cheng Gu <gucheng@google.com>
2 files changed