msm: mhi: Provide an API to perform host reset request

Adding new API to perform host reset request to device
to collect device side dumps.

Use mhi_soc_reset() API in place of register write

Currently, a direct register write is used when ramdump collection
in panic path occurs. Replace that with new mhi_soc_reset() API
such that a controller defined reset() function is exercised if
one is present and the regular SOC reset is done if it is not.

Change-Id: Ibd15b231072a9b811ced0031387d605184806e9a
Signed-off-by: Vivek Pernamitta <vpernami@codeaurora.org>
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>