tests: benchmark: timing_info: Change API/variable Name.

The API/Variable names in timing_info looks very speicific to
platform (like systick etc), whereas these variabled are used
across platforms (nrf/arm/quark).
So this patch :-
1. changing API/Variable names to generic one.
2. Creating some of Macros whose implimentation is platform
depenent.

Jira: ZEP-2314

Signed-off-by: Youvedeep Singh <youvedeep.singh@intel.com>

arch/arm/core/isr_wrapper.S

@@ -44,7 +44,7 @@ SECTION_FUNC(TEXT, _isr_wrapper)
 	push {lr}		/* lr is now the first item on the stack */
 
 #ifdef CONFIG_EXECUTION_BENCHMARKING
-	bl read_systick_start_of_isr
+	bl read_timer_start_of_isr
 #endif
 
 #ifdef CONFIG_KERNEL_EVENT_LOGGER_INTERRUPT
@@ -114,7 +114,7 @@ _idle_state_cleared:
 	push {r3}
 #endif
 	push {lr}
-	bl read_systick_end_of_isr
+	bl read_timer_end_of_isr
 #if defined(CONFIG_ARMV6_M)
 	pop {r3}
 	mov lr,r3

arch/arm/core/swap.S

@@ -190,7 +190,7 @@ _thread_irq_disabled:
 #endif
     push {lr}
 
-    bl read_systick_end_of_swap
+    bl read_timer_end_of_swap
 
 #if defined(CONFIG_ARMV6_M)
     pop {r3}
@@ -367,7 +367,7 @@ SECTION_FUNC(TEXT, __swap)
     push {r3}
 #endif
     push {lr}
-    bl read_systick_start_of_swap
+    bl read_timer_start_of_swap
 #if defined(CONFIG_ARMV6_M)
     pop {r3}
     mov lr,r3