lib: sbi: Simplify HSM platform operations

Instead of having hsm_start(), hsm_stop() and hsm_suspend()
callbacks in platform operations, it will be much simpler for
HSM driver to directly register these operations as a device
to the sbi_hsm implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

lib/sbi/sbi_platform.c

@@ -19,15 +19,9 @@ static inline char *sbi_platform_feature_id2string(unsigned long feature)
 		return NULL;
 
 	switch (feature) {
-	case SBI_PLATFORM_HAS_HART_HOTPLUG:
-		fstr = "hotplug";
-		break;
 	case SBI_PLATFORM_HAS_MFAULTS_DELEGATION:
 		fstr = "mfdeleg";
 		break;
-	case SBI_PLATFORM_HAS_HART_SECONDARY_BOOT:
-		fstr = "sec_boot";
-		break;
 	default:
 		break;
 	}