getting_started: update dependency for Fedora 27
Update the build dependency for Fedora. 'gnu-efi' was listed as
a dependency but it's actually 'gnu-efi-devel' that we need else
the header file ('efi.h') is not installed.
@@ -338,7 +338,7 @@ each with their own way to install development tools:
.. code-block:: console
$ sudo dnf install gcc \
- gnu-efi \
+ gnu-efi-devel \
libuuid-devel \
openssl-devel \
libpciaccess-devel
