gallium: Rename macros HAVE_PIPE_LOADER*

Rename macro HAVE_PIPE_LOADER_DRI to HAVE_DRI
Rename macro HAVE_PIPE_LOADER_KMS to HAVE_DRISW_KMS

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Eric Engestrom <eric@igalia.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17784>

meson.build

@@ -1690,10 +1690,10 @@ if dep_libdrm.found()
 endif
 
 if with_dri
-  pre_args += '-DHAVE_PIPE_LOADER_DRI'
+  pre_args += '-DHAVE_DRI'
 endif
 if with_gallium_drisw_kms
-  pre_args += '-DHAVE_PIPE_LOADER_KMS'
+  pre_args += '-DHAVE_DRISW_KMS'
 endif
 
 dep_libudev = dependency('libudev', required : false)