toolchain: drop the now-unused old BR2_TOOLCHAIN_HAS_ATOMIC_INTRINSICS

It's now been replaced with BR2_ARCH_HAS_ATOMICS, annd all packages have
been changed to use that instead.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Anton Kolesov <Anton.Kolesov@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

arch/Config.in

@@ -254,7 +254,6 @@ config BR2_GCC_TARGET_MODE
 config BR2_ARCH_HAS_ATOMICS
 	bool
 	default y if !BR2_arc
-	select BR2_TOOLCHAIN_HAS_ATOMIC_INTRINSICS
 
 # Set up target binary format
 choice

toolchain/toolchain-common.in

@@ -44,9 +44,6 @@ config BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS
 config BR2_TOOLCHAIN_HAS_SSP
 	bool
 
-config BR2_TOOLCHAIN_HAS_ATOMIC_INTRINSICS
-	bool
-
 config BR2_ENABLE_LOCALE_PURGE
 	bool "Purge unwanted locales"
 	help