testsuite: [arm/cde] Include arm_cde.h and arm_mve.h in arm_v8*m_main_cde*

testsuite: [arm/cde] Include arm_cde.h and arm_mve.h in arm_v8*m_main_cde*

Since arm_cde.h includes stdint.h, its use requires the presence of
the right gnu/stub-*.h, so make sure to include it when checking the
arm_v8*m_main_cde* effective targets, otherwise we can decide CDE is
supported while it's not really (all tests that use arm_v8m_main_cde*
also include arm_cde.h aynway).

Similarly for the effective targets that also require MVE.

This makes several tests unsupported rather than fail.

2020-04-22  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/testsuite/
	* lib/target-supports.exp (arm_v8m_main_cde, arm_v8m_main_cde_fp)
	(arm_v8_1m_main_cde_mve, arm_v8_1m_main_cde_mve_fp): Include
	arm_cde.h and arm_mve.h as ineeded.