Remove __ARM_EABI__ from sys/arm/arm, building for oabi is unsupported.

sys/arm/arm/elf_trampoline.c

@@ -725,7 +725,6 @@ __start(void)
 	    (unsigned int)(&load_kernel) + 800, sp);
 }
 
-#ifdef __ARM_EABI__
 /* We need to provide these functions but never call them */
 void __aeabi_unwind_cpp_pr0(void);
 void __aeabi_unwind_cpp_pr1(void);
@@ -737,5 +736,3 @@ void
 __aeabi_unwind_cpp_pr0(void)
 {
 }
-#endif
-

sys/arm/arm/exception.S

@@ -237,7 +237,6 @@ _C_LABEL(dtrace_invop_calltrap_addr):
 	ldmia	sp, {sp, lr, pc}^	/* Restore lr and exit */
 #endif
 
-#if defined(__ARM_EABI__)
 /*
  * Unwind hints so we can unwind past functions that use
  * PULLFRAMEFROMSVCANDEXIT. They are run in reverse order.
@@ -249,9 +248,6 @@ _C_LABEL(dtrace_invop_calltrap_addr):
 	.pad #(2*4);			/* Skip user sp and lr */	   \
 	.save {r0-r12};			/* Restore r0-r12 */		   \
 	.pad #(4)			/* Skip spsr */
-#else
-#define	UNWINDSVCFRAME
-#endif
 
 #define	DO_AST								   \
 	ldr	r0, [sp];		/* Get the SPSR from stack */	   \

sys/arm/arm/stack_machdep.c

@@ -49,16 +49,6 @@ extern vm_offset_t kernel_vm_end;
 static void
 stack_capture(struct stack *st, u_int32_t *frame)
 {
-#if !defined(__ARM_EABI__) && !defined(__clang__)
-	vm_offset_t callpc;
-
-	while (INKERNEL(frame) && (vm_offset_t)frame < kernel_vm_end) {
-		callpc = frame[FR_SCP];
-		if (stack_put(st, callpc) == -1)
-			break;
-		frame = (u_int32_t *)(frame[FR_RFP]);
-	}
-#endif
 }
 
 void