include: sbi: Change spec version to 2.0

Now that SBI v2.0 specification is frozen, we change spec version
implemented by OpenSBI to v2.0.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>

include/sbi/sbi_ecall.h

@@ -13,7 +13,7 @@
 #include <sbi/sbi_types.h>
 #include <sbi/sbi_list.h>
 
-#define SBI_ECALL_VERSION_MAJOR		1
+#define SBI_ECALL_VERSION_MAJOR		2
 #define SBI_ECALL_VERSION_MINOR		0
 #define SBI_OPENSBI_IMPID		1