arm, arm64: tweak hard-coded load addresses for PIE binaries

They are used when ASLR is not applied.
The need for adjusting is due to rtld direct exec mode puts ld-elf.so.1
at the PIE load address, and this address must not conflict with the
default linker' load address for non-PIE binaries.  Otherwise rtld in
direct mode cannot activate image.  Example of implicit failure is ldd(1)
refusing to run.

Reported by:	kp
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D37085

sys/arm/include/elf.h

@@ -78,7 +78,7 @@ __ElfType(Auxinfo);
 #define	EF_ARM_EABI_VERSION_UNKNOWN 0
 #define	EF_ARM_EABI_FREEBSD_MIN 4
 
-#define	ET_DYN_LOAD_ADDR	0x500000
+#define	ET_DYN_LOAD_ADDR 0x01001000
 
 /* Flags passed in AT_HWCAP. */
 #define	HWCAP_SWP		0x00000001	/* Unsupported, never set.    */

sys/arm64/include/elf.h

@@ -86,7 +86,7 @@ __ElfType(Auxinfo);
 #endif
 
 #if __ELF_WORD_SIZE == 32
-#define	ET_DYN_LOAD_ADDR 0x12000
+#define	ET_DYN_LOAD_ADDR 0x01001000
 #else
 #define	ET_DYN_LOAD_ADDR 0x100000
 #endif