sdk: Minor spec cleanups

This patch does some minor cleanups on the spec file as suggested by
Christopher Meng <cickumqt@gmail.com> in the bug opened in order to
rename the package in Fedora:

https://bugzilla.redhat.com/1004029

Change-Id: Ibafd5b3772b55e1b1fbacd0f696c1bec79296862
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>