feat(neoverse-rd): add MHUv3 doorbell channels on third gen platforms

Define and use a new scmi_channel_plat_info_t structure specific to
third generation Neoverse platforms in order to use MHUv3 doorbell
channels. The structure uses the existing mhu_ring_doorbell method for
ring_doorbell implementation.

Signed-off-by: Shriram K <shriram.k@arm.com>
Signed-off-by: Vivek Gautam <vivek.gautam@arm.com>
Change-Id: Icf3be5305df94ba944038a4d4fdf0ccf32168650
1 file changed