MdeModulePkg/Core/Pei: Make migrated PEIM message verbose

MdeModulePkg/Core/Pei: Make migrated PEIM message verbose

Currently, the debug message that prints the name of a PEIM
being migrated is DEBUG_INFO while similar messages are
DEBUG_VERBOSE. This change updates the print level to
DEBUG_VERBOSE for consistency.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Dandan Bi <dandan.bi@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>