RISC-V: selftests: cbo: Use exported __cpu_to_le32() with uapi header

cpu_to_le32 is not defined in uapi headers, and it could cause an error
of impossible constraint in 'asm' during compilation. However,
the reason is due to undefined reference to cpu_to_le32.
__cpu_to_le32() defined from byteorder.h should be used instead.

Signed-off-by: Hsieh-Tseng Shen <woodrow.shen@sifive.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>

tools/testing/selftests/riscv/hwprobe/cbo.c

@@ -15,11 +15,12 @@
 #include <linux/compiler.h>
 #include <linux/kernel.h>
 #include <asm/ucontext.h>
+#include <asm/byteorder.h>
 
 #include "hwprobe.h"
 #include "../../kselftest.h"
 
-#define MK_CBO(fn) cpu_to_le32((fn) << 20 | 10 << 15 | 2 << 12 | 0 << 7 | 15)
+#define MK_CBO(fn) __cpu_to_le32((fn) << 20 | 10 << 15 | 2 << 12 | 0 << 7 | 15)
 
 static char mem[4096] __aligned(4096) = { [0 ... 4095] = 0xa5 };