target/hexagon: Rename macros.inc -> macros.h.inc

Since commits 139c1837db ("meson: rename included C source files
to .c.inc") and 0979ed017f ("meson: rename .inc.h files to .h.inc"),
EMU standard p

target/hexagon: Rename macros.inc -> macros.h.inc

Since commits 139c1837db ("meson: rename included C source files
to .c.inc") and 0979ed017f ("meson: rename .inc.h files to .h.inc"),
EMU standard procedure for included header files is to use *.h.inc.

Besides, since commit 6a0057aa22 ("docs/devel: make a statement
about includes") this is documented in the Coding Style:

If you do use template header files they should be named with
the ``.c.inc`` or ``.h.inc`` suffix to make it clear they are
being included for expansion.

Therefore rename "macros.inc" as "macros.h.inc".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Brian Cain <bcain@quicinc.com>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

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