riscv: Change phys_addr_t and phys_size_t to 64-bit

phys_addr_t and phys_size_t are currently defined as `unsigned long`,
but RV32 supports 34-bit physical address, hence both phys_addr_t and
phys_size_t should be defined to 64-bit using `unsigned long long`.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
diff --git a/arch/riscv/include/asm/types.h b/arch/riscv/include/asm/types.h
index b800b2d..49f7a5d 100644
--- a/arch/riscv/include/asm/types.h
+++ b/arch/riscv/include/asm/types.h
@@ -35,8 +35,8 @@
 typedef u32 dma_addr_t;
 #endif
 
-typedef unsigned long phys_addr_t;
-typedef unsigned long phys_size_t;
+typedef unsigned long long phys_addr_t;
+typedef unsigned long long phys_size_t;
 
 #endif /* __KERNEL__ */