packagegroup-core-tools-profile.bb: Enable aarch64 valgrind

packagegroup-core-tools-profile.bb: Enable aarch64 valgrind

The Valgrind recipe has had support for aarch64 for 9 years but the
packagegroup-core-tools-profile recipe still excludes valgrind on
aarch64 builds. This patch adds Valgrind when building the
package-group-core-tools-profile for aarch64 systems.

Signed-off-by: John Ripple <john.ripple@keysight.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>