target/arm: Move FPSCR get/set helpers to tcg/vfp_helper.c

target/arm: Move FPSCR get/set helpers to tcg/vfp_helper.c

Currently the helper_vfp_get_fpscr() and helper_vfp_set_fpscr()
functions do the actual work of updating the FPSCR, and we have
wrappers vfp_get_fpscr() and vfp_set_fpscr() which we use for calls
from other QEMU C code.

Flip these around so that it is vfp_get_fpscr() and vfp_set_fpscr()
which do the actual work, and helper_vfp_get_fpscr() and
helper_vfp_set_fpscr() which are the wrappers; this allows us to move
them to tcg/vfp_helper.c.

Since this is the last HELPER() we had in arm/vfp_helper.c, we can
drop the include of helper-proto.h.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250221190957.811948-3-peter.maydell@linaro.org