fix: fix build with clang-18

Some uses of inline assembly for accessing floating point registers did
not enable the FP extension and were failing with clang-18.

The check in the linker script for the `hftest_enable` variable fails
under clang-18. However, hftest still compiles and passes without the
check, so it was removed.

Fix new warnings from `clang-tidy`.

Apply `make format`.

Change-Id: I43996abb4c42de54be807dcdb76107b9752c62fb
Signed-off-by: Karl Meakin <karl.meakin@arm.com>
diff --git a/inc/vmapi/hf/ffa.h b/inc/vmapi/hf/ffa.h
index 5a0a468..a13e505 100644
--- a/inc/vmapi/hf/ffa.h
+++ b/inc/vmapi/hf/ffa.h
@@ -676,6 +676,7 @@
 
 static inline enum ffa_error ffa_error_code(struct ffa_value val)
 {
+	/* NOLINTNEXTLINE(EnumCastOutOfRange) */
 	return (enum ffa_error)val.arg2;
 }