MdeModulePkg/DxeCapsuleLibFmp: Fix compilation error

The commit "MdeModulePkg/DxeCapsuleLibFmp: Fix crash if no ESRT is
found" leads to a compilation error in
MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.inf. The issue
occurs because the variable mDxeCapsuleLibReadyToBootEvent which is
declared as extern does not exist, while it is defined in
DxeCapsuleRuntime.c, a file not included in DxeCapsuleLib.inf. This
patch is to fix this by moving the variable defintion to DxeCapsuleLib.c
and declare it as extern in DxeCapsuleRuntime.c.

Reported-by: Gua Guo <gua.guo@intel.com>
Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>
2 files changed