Rewrite handleIpmbChannel api

Rewriting new_method_call to yield_method_calll for handleIpmbChannel

Tested:
Verified using below send message commands
1. Send message command
Command:
 FS0:\cmdtool\> cmdtool.efi 20 18 34 06 2C 00 00 FC FC 04 00 2C FC 04
                 C1 13
Response: 00                   //Success

2. Get message command
Commad: FS0:\cmdtool\> cmdtool.efi 20 18 33
Response: 00 FC FC 04 00 2C FC 04 C1 13

Signed-off-by: srikanta mondal <srikantax.mondal@intel.com>
Change-Id: I9b461ddbc3a93b67e26ec92ff7c41fdc97e49931
2 files changed