Get rid of some crufty macros.

These were macros that were never used, or that were only set to one thing and
could be substituted up front.

I left in code guarded by the HAVE_ENDIAN_H and HAVE_LITTLE_ENDIAN macros even
though those are never defined because they guard a reportedly significantly
faster implementation of some functionality, at least according to a comment
in the source. It would be a good idea to enable that code path and see if it
really does make a big difference before removing it entirely.

BUG=None
TEST=Built for Link, Daisy, and the host with FEATURES=test. Built depthcharge
for Link and booted in normal mode.
BRANCH=None

Change-Id: I934a4dd0da169ac018ba07350d56924ab88b1acc
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/45687
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>

firmware/include/bmpblk_header.h

@@ -47,8 +47,6 @@
 
 #include "sysincludes.h"
 
-__pragma(pack(push, 1))  /* Support packing for MSVC. */
-
 #define BMPBLOCK_SIGNATURE      "$BMP"
 #define BMPBLOCK_SIGNATURE_SIZE (4)
 
@@ -149,6 +147,4 @@ typedef enum Compression {
 #define RENDER_HWID       "$HWID"
 #define RENDER_HWID_RTOL  "$HWID.rtol"
 
-__pragma(pack(pop)) /* Support packing for MSVC. */
-
 #endif  /* VBOOT_REFERENCE_BMPBLK_HEADER_H_ */