tests: kernel: fpu_sharing Fixed missing struct defs for ARM

Added empty fp register structs for ARM combinations not handled,
i.e. any ARM without a fpu.

Signed-off-by: Lars-Ove Karlsson <[email protected]>

Author: LoveKarlsson

tests/kernel/fpu_sharing/generic/src/float_context.h

@@ -96,6 +96,16 @@ struct fp_non_volatile_register_set {
 	float s[16];
 };
 
+#else
+
+struct fp_volatile_register_set {
+	/* No volatile floating point registers */
+};
+
+struct fp_non_volatile_register_set {
+	/* No non-volatile floating point registers */
+};
+
 #endif
 
 #define SIZEOF_FP_VOLATILE_REGISTER_SET	\