Revert "Add template parameters to MQDescriptor"

Revert "Change payload type to int32_t for fmq device tests"

Revert submission 1431616-thirtytwo

Reason for revert: This topic broke the aosp_x86-userdebug target. Details at http://b/169077648

Reverted Changes:
If736389eb:Add template parameters to MQDescriptor
Ice9c28c3d:Change HIDL fmq tests to use int32_t for payload
Ia18d8459b:Add template arguments to MQDescriptor for AIDL
I95586cc83:Change payload type to int32_t for fmq device test...

Change-Id: Ib7c409b164c76517d642a415cdfc2406e4f2f351