Cleanup: remove unnecessary const variable (#1399)

portable/GCC/RISC-V/port.c

diff --git a/portable/GCC/RISC-V/port.c b/portable/GCC/RISC-V/port.c
index e0974d1..32eaa33 100644
--- a/portable/GCC/RISC-V/port.c
+++ b/portable/GCC/RISC-V/port.c
@@ -90,7 +90,6 @@
 uint64_t ullNextTime = 0ULL;
 const uint64_t * pullNextTime = &ullNextTime;
 const size_t uxTimerIncrementsForOneTick = ( size_t ) ( ( configCPU_CLOCK_HZ ) / ( configTICK_RATE_HZ ) ); /* Assumes increment won't go over 32-bits. */
-UBaseType_t const ullMachineTimerCompareRegisterBase = configMTIMECMP_BASE_ADDRESS;
 volatile uint64_t * pullMachineTimerCompareRegister = NULL;
 
 /* Holds the critical nesting value - deliberately non-zero at start up to
@@ -136,7 +135,7 @@
 
         __asm volatile ( "csrr %0, mhartid" : "=r" ( ulHartId ) );
 
-        pullMachineTimerCompareRegister = ( volatile uint64_t * ) ( ullMachineTimerCompareRegisterBase + ( ulHartId * sizeof( uint64_t ) ) );
+        pullMachineTimerCompareRegister = ( volatile uint64_t * ) ( configMTIMECMP_BASE_ADDRESS + ( ulHartId * sizeof( uint64_t ) ) );
 
         do
         {

portable/IAR/RISC-V/port.c

diff --git a/portable/IAR/RISC-V/port.c b/portable/IAR/RISC-V/port.c
index ec11fc4..0a2864b 100644
--- a/portable/IAR/RISC-V/port.c
+++ b/portable/IAR/RISC-V/port.c
@@ -98,7 +98,6 @@
 uint64_t ullNextTime = 0ULL;
 const uint64_t * pullNextTime = &ullNextTime;
 const size_t uxTimerIncrementsForOneTick = ( size_t ) ( ( configCPU_CLOCK_HZ ) / ( configTICK_RATE_HZ ) ); /* Assumes increment won't go over 32-bits. */
-UBaseType_t const ullMachineTimerCompareRegisterBase = configMTIMECMP_BASE_ADDRESS;
 volatile uint64_t * pullMachineTimerCompareRegister = NULL;
 
 /* Holds the critical nesting value - deliberately non-zero at start up to
@@ -169,7 +168,7 @@
 
         __asm volatile ( "csrr %0, 0xf14" : "=r" ( ulHartId ) ); /* 0xf14 is HART ID. */
 
-        pullMachineTimerCompareRegister = ( volatile uint64_t * ) ( ullMachineTimerCompareRegisterBase + ( ulHartId * sizeof( uint64_t ) ) );
+        pullMachineTimerCompareRegister = ( volatile uint64_t * ) ( configMTIMECMP_BASE_ADDRESS + ( ulHartId * sizeof( uint64_t ) ) );
 
         do
         {