The offset inside the page wasn't included in the copy call meaning
the start of the page was being read/written instead.
Reported-by: NJay Cornwall <Jay.Cornwall@amd.com>
Signed-off-by: NTom St Denis <tom.stdenis@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>