hw/display/omap_lcdc: Drop broken bigendian ifdef

The draw_line16_32() function in the omap_lcdc template header
includes an ifdef for the case where HOST_WORDS_BIGENDIAN matches
TARGET_WORDS_BIGENDIAN.  This is trying to optimise for "source
bitmap and destination bitmap format match", but it is broken,
because in this function the formats don't match: the source is
16-bit colour and the destination is 32-bit colour, so a memcpy()
will produce corrupted graphics output.  Drop the bogus ifdef.

This bug was introduced in commit ea644cf343, when we dropped
support for DEPTH values other than 32 from the template header.
The old #if line was
  #if DEPTH == 16 && defined(HOST_WORDS_BIGENDIAN) == defined(TARGET_WORDS_BIGENDIAN)
and this was mistakenly changed to
  #if defined(HOST_WORDS_BIGENDIAN) == defined(TARGET_WORDS_BIGENDIAN)
rather than deleting the #if as now having an always-false condition.

Fixes: ea644cf343
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20210215103215.4944-7-peter.maydell@linaro.org

hw/display/omap_lcd_template.h

@@ -139,9 +139,6 @@ static void draw_line12_32(void *opaque, uint8_t *d, const uint8_t *s,
 static void draw_line16_32(void *opaque, uint8_t *d, const uint8_t *s,
                            int width, int deststep)
 {
-#if defined(HOST_WORDS_BIGENDIAN) == defined(TARGET_WORDS_BIGENDIAN)
-    memcpy(d, s, width * 2);
-#else
     uint16_t v;
     uint8_t r, g, b;
 
@@ -154,5 +151,4 @@ static void draw_line16_32(void *opaque, uint8_t *d, const uint8_t *s,
         s += 2;
         d += 4;
     } while (-- width != 0);
-#endif
 }