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mod/mhu3: Fix doorbell channel trigger interrupt

Darryl Green requested to merge github/fork/girishpathak/mhu3_dbch_fix into master

Created by: girishpathak

To trigger an interrupt on a doorbell channel corresponding PDBCW_ST bit of the PBX(postbox) is validated. If corresponding bit is unset then the code will raise the doorbell interrupt, otherwise it will return an error FWK_E_STATE. This validation check is incorrect and this change fixes this.

Change-Id: I84b19832b1d128176a2b77f2f5abc3c3cb1d92c0 Signed-off-by: Girish Pathak girish.pathak@arm.com

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