Vlv2TbltDevicePkg/FvbRuntimeDxe: Remove unused variables
Vlv2TbltDevicePkg/FvbRuntimeDxe: Remove unused variables

Fix the following errors from gcc:

Vlv2TbltDevicePkg/FvbRuntimeDxe/FvbService.c: In function ‘FvbWriteBlock’:
Vlv2TbltDevicePkg/FvbRuntimeDxe/FvbService.c:368:44: error: variable ‘FwhInstance’ set but not used [-Werror=unused-but-set-variable]

Vlv2TbltDevicePkg/FvbRuntimeDxe/FvbService.c: In function ‘FvbEraseBlock’:
Vlv2TbltDevicePkg/FvbRuntimeDxe/FvbService.c:448:44: error: variable ‘FwhInstance’ set but not used [-Werror=unused-but-set-variable]

Vlv2TbltDevicePkg/FvbRuntimeDxe/FvbService.c: In function ‘FvbInitialize’:
Vlv2TbltDevicePkg/FvbRuntimeDxe/FvbService.c:1028:41: error: variable ‘FvHeaderValid’ set but not used [-Werror=unused-but-set-variable]

Cc: David Wei <b5f26b2a2cdf37ab487a7004176f1783629975b0@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gary Lin <a057d4b27e9e9055b973f54b519db54c22ed5ee8@suse.com>

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