xen/sysctl: make CONFIG_COVERAGE depend on CONFIG_SYSCTL

Users rely on SYSCTL_coverage_op hypercall to interact with the coverage data,
that is, according operations shall be wrapped around with CONFIG_SYSCTL.
Right now, it is compiled under CONFIG_COVERAGE, so we shall make
CONFIG_COVERAGE depend on CONFIG_SYSCTL.

Signed-off-by: Penny Zheng <Penny.Zheng@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/Kconfig.debug

@@ -37,7 +37,7 @@ config SELF_TESTS
 
 config COVERAGE
 	bool "Code coverage support"
-	depends on !LIVEPATCH
+	depends on SYSCTL && !LIVEPATCH
 	select SUPPRESS_DUPLICATE_SYMBOL_WARNINGS if !ENFORCE_UNIQUE_SYMBOLS
 	help
 	  Enable code coverage support.