kernel: Remove CONFIG_COMPAT

This removes support for executing old 32 bit applications on 64 bit ARM
and MIPS kernels.
On OpenWrt we normally compile all the user space applications on our
own and do not support third party binary only modules especial not 32
bit applications on 64 bit CPUs.

This reduces the attack surface on such systems and should also save
some memory.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/octeontx/config-4.14

@@ -20,7 +20,6 @@ CONFIG_ARCH_HIBERNATION_POSSIBLE=y
 CONFIG_ARCH_MMAP_RND_BITS=18
 CONFIG_ARCH_MMAP_RND_BITS_MAX=33
 CONFIG_ARCH_MMAP_RND_BITS_MIN=18
-CONFIG_ARCH_MMAP_RND_COMPAT_BITS=11
 CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=11
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX is not set
 # CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT is not set
@@ -60,7 +59,6 @@ CONFIG_ARM64_VA_BITS=48
 # CONFIG_ARM64_VA_BITS_39 is not set
 CONFIG_ARM64_VA_BITS_48=y
 CONFIG_ARM64_VHE=y
-# CONFIG_ARMV8_DEPRECATED is not set
 CONFIG_ARM_AMBA=y
 CONFIG_ARM_ARCH_TIMER=y
 CONFIG_ARM_ARCH_TIMER_EVTSTREAM=y
@@ -88,7 +86,6 @@ CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BLK_MQ_VIRTIO=y
 CONFIG_BLK_SCSI_REQUEST=y
-CONFIG_BLOCK_COMPAT=y
 CONFIG_BOUNCE=y
 CONFIG_BPF_JIT=y
 CONFIG_CAN=y
@@ -119,10 +116,6 @@ CONFIG_COMMON_CLK=y
 CONFIG_COMMON_CLK_CS2000_CP=y
 # CONFIG_COMMON_CLK_VERSATILE is not set
 CONFIG_COMMON_CLK_XGENE=y
-CONFIG_COMPAT=y
-CONFIG_COMPAT_BINFMT_ELF=y
-CONFIG_COMPAT_NETLINK_MESSAGES=y
-CONFIG_COMPAT_OLD_SIGACTION=y
 CONFIG_CONFIGFS_FS=y
 CONFIG_CPUSETS=y
 # CONFIG_CPU_BIG_ENDIAN is not set
@@ -259,7 +252,6 @@ CONFIG_HAVE_ARCH_HUGE_VMAP=y
 CONFIG_HAVE_ARCH_JUMP_LABEL=y
 CONFIG_HAVE_ARCH_KASAN=y
 CONFIG_HAVE_ARCH_KGDB=y
-CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y
 CONFIG_HAVE_ARCH_PFN_VALID=y
 CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
 CONFIG_HAVE_ARCH_TRACEHOOK=y
@@ -299,7 +291,6 @@ CONFIG_HAVE_RCU_TABLE_FREE=y
 CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
 CONFIG_HAVE_SETUP_PER_CPU_AREA=y
 CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
-CONFIG_HAVE_UID16=y
 CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
 CONFIG_HIBERNATE_CALLBACKS=y
 CONFIG_HIBERNATION=y
@@ -392,7 +383,6 @@ CONFIG_OF_NUMA=y
 CONFIG_OF_PCI=y
 CONFIG_OF_PCI_IRQ=y
 CONFIG_OF_RESERVED_MEM=y
-CONFIG_OLD_SIGSUSPEND3=y
 CONFIG_OPTEE=y
 CONFIG_PADATA=y
 CONFIG_PAGE_COUNTER=y
@@ -498,7 +488,6 @@ CONFIG_SWPHY=y
 CONFIG_SYNC_FILE=y
 CONFIG_SYSCON_REBOOT_MODE=y
 CONFIG_SYSCTL_EXCEPTION_TRACE=y
-CONFIG_SYSVIPC_COMPAT=y
 CONFIG_SYS_SUPPORTS_HUGETLBFS=y
 CONFIG_TASKSTATS=y
 CONFIG_TASK_DELAY_ACCT=y