doc: fix Build EFI-Stub fail problem
In the "Enable ACRN Secure Boot With EFI-Stub" guide, to build EFI-Stub
smoothly, the installation of "gnu-efi" package is added to GSG.
@@ -129,7 +129,8 @@ To set up the ACRN build environment on the development computer:
libsdl2-dev \
libegl-dev \
libgles-dev \
- libdrm-dev
+ libdrm-dev \
+ gnu-efi
#. Install Python package dependencies:
