MdeModulePkg BootScriptExecutorDxe: Use NASM compatible syntax

Without this change, after converting this code to NASM, this error
will be reported:
error: invalid combination of opcode and operands

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
2 files changed