Fix OpenCL test crash on some devices

Replace constexpr with const in kernel source
codes because some kernel compiler doesn't
support constexpr.

Replace scheduler with __amd_rocclr_scheduler
due to name change.

Change-Id: I1ad4ddcdf1df5237b83e1ea2447eb39a19f7dc4a

rocclr/device/gpu/gpuschedcl.cpp

@@ -164,17 +164,17 @@ typedef struct _HwDispatch {
     uint    padd41;         // 0x00000021
 } HwDispatch;
 \n
-static constexpr uint WavefrontSize     = 64;
-static constexpr uint MaxWaveSize       = 0x400;
-static constexpr uint UsrRegOffset      = 0x240;
-static constexpr uint Pm4Nop            = 0xC0001002;
-static constexpr uint Pm4UserRegs       = 0xC0007602;
-static constexpr uint Pm4CopyReg        = 0xC0044000;
-static constexpr uint PrivateSegEna     = 0x1;
-static constexpr uint DispatchEna       = 0x2;
-static constexpr uint QueuePtrEna       = 0x4;
-static constexpr uint KernelArgEna      = 0x8;
-static constexpr uint FlatScratchEna    = 0x20;
+static const uint WavefrontSize     = 64;
+static const uint MaxWaveSize       = 0x400;
+static const uint UsrRegOffset      = 0x240;
+static const uint Pm4Nop            = 0xC0001002;
+static const uint Pm4UserRegs       = 0xC0007602;
+static const uint Pm4CopyReg        = 0xC0044000;
+static const uint PrivateSegEna     = 0x1;
+static const uint DispatchEna       = 0x2;
+static const uint QueuePtrEna       = 0x4;
+static const uint KernelArgEna      = 0x8;
+static const uint FlatScratchEna    = 0x20;
 \n
 uint GetCmdTemplateHeaderSize() { return sizeof(HwDispatchHeader); }
 \n
@@ -297,7 +297,7 @@ void RunCmdTemplateDispatch(
 }
 \n
 __kernel void
-scheduler(
+__amd_rocclr_scheduler(
     __global void * queue,
     __global void * params,
     uint paramIdx)