riscv: Respect dependencies of ARCH_HAS_ELF_CORE_EFLAGS

This kconfig symbol has dependencies and is only selectable if those
dependencies are also enabled.

Respect the dependencies.

Fixes the following warning when configuring an 'allnoconfig':

WARNING: unmet direct dependencies detected for ARCH_HAS_ELF_CORE_EFLAGS
  Depends on [n]: BINFMT_ELF [=n] && ELF_CORE [=y]
  Selected by [y]:
  - RISCV [=y]

Fixes: 8c94db0 ("binfmt_elf: preserve original ELF e_flags for core dumps")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://lore.kernel.org/r/20251009-riscv-elf-core-eflags-v1-1-e9b45ab6b36d@linutronix.de
Signed-off-by: Paul Walmsley <pjw@kernel.org>

Author: t-8ch

arch/riscv/Kconfig

@@ -29,7 +29,7 @@ config RISCV
 	select ARCH_HAS_DEBUG_VIRTUAL if MMU
 	select ARCH_HAS_DEBUG_VM_PGTABLE
 	select ARCH_HAS_DEBUG_WX
-	select ARCH_HAS_ELF_CORE_EFLAGS
+	select ARCH_HAS_ELF_CORE_EFLAGS if BINFMT_ELF && ELF_CORE
 	select ARCH_HAS_FAST_MULTIPLIER
 	select ARCH_HAS_FORTIFY_SOURCE
 	select ARCH_HAS_GCOV_PROFILE_ALL