Arch: Add function to configure coprocessors

Adds a function to do architecture-specific coprocessor configuration
and implements it to configure the FPU as appropriate for all supported
architectures.

Change-Id: Ie09b27513b57d561081d10271f2042b5d965b0fd
Signed-off-by: Jamie Fox <jamie.fox@arm.com>
diff --git a/secure_fw/spm/include/tfm_arch.h b/secure_fw/spm/include/tfm_arch.h
index 96251ae..4bf7f16 100644
--- a/secure_fw/spm/include/tfm_arch.h
+++ b/secure_fw/spm/include/tfm_arch.h
@@ -118,6 +118,11 @@
  */
 void tfm_arch_prioritize_secure_exception(void);
 
+/**
+ * \brief Configure coprocessors
+ */
+void tfm_arch_configure_coprocessors(void);
+
 /*
  * Clear float point status.
  */