riscv: remove the HAVE_KPROBES option

HAVE_KPROBES is defined genericly in arch/Kconfig and architectures
should just select it if supported.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NPalmer Dabbelt <palmer@sifive.com>

arch/riscv/Kconfig

@@ -94,9 +94,6 @@ config PGTABLE_LEVELS
 	default 3 if 64BIT
 	default 2
 
-config HAVE_KPROBES
-	def_bool n
-
 menu "Platform type"
 
 choice