packagegroup-core-sdk: update sanitizer lists

aarch64 has been supported since GCC 5.1, sparc has been supported
since 4.9, and S390 since 7.1.

(From OE-Core rev: a2cbb5dc4c6191ca343dc4211abde693dc1a579a)

Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/packagegroups/packagegroup-core-sdk.bb

@@ -27,12 +27,9 @@ RDEPENDS_packagegroup-core-sdk = "\
     tcl"
 
 SANITIZERS = "libasan-dev libubsan-dev"
-SANITIZERS_aarch64 = ""
 SANITIZERS_microblaze = ""
 SANITIZERS_mipsarch = ""
 SANITIZERS_nios2 = ""
-SANITIZERS_powerpc64 = ""
-SANITIZERS_sparc = ""
 SANITIZERS_riscv64 = ""
 SANITIZERS_libc-musl = ""