ARM updates

Due to the ABI we are using we have to use the earm architecture
moniker for the build system to behave correctly. This involves
then some headers to move around.

There is also a few related Makefile updates as well as minor
source code corrections.

include/arch/earm/include/stackframe.h

@@ -0,0 +1,26 @@
+#ifndef _ARM_STACKFRAME_H
+#define _ARM_STACKFRAME_H
+
+typedef u32_t reg_t;         /* machine register */
+
+struct stackframe_s {
+	reg_t retreg;                 /*  r0 */
+	reg_t r1;
+	reg_t r2;
+	reg_t r3;
+	reg_t r4;
+	reg_t r5;
+	reg_t r6;
+	reg_t r7;
+	reg_t r8;
+	reg_t r9;                     /*  sb */
+	reg_t r10;                    /*  sl */
+	reg_t fp;                     /*  r11 */
+	reg_t r12;                    /*  ip */
+	reg_t sp;                     /*  r13 */
+	reg_t lr;                     /*  r14 */
+	reg_t pc;                     /*  r15  */
+	reg_t psr;
+};
+
+#endif /* _ARM_STACKFRAME_H */