build: fix centos-8 'make install-deps' enable PowerTools repo

- The name of the powertools repo was changed [0]
  in centos-8 from 'PowerTools' to 'powertools'.
  Retrieve the correct name from 'dnf repolist all'
  instead of hard coding it.

[0] https://git.centos.org/rpms/centos-repos/c/b759b17557b9577e8ea156740af0249ab1a22d70

Type: fix

Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
Change-Id: Ic1402e671eb1d70dec429bab82ad18d8251f4eef

Author: dwallacelf

Makefile

@@ -284,7 +284,8 @@ ifeq ($(OS_ID),rhel)
 	@sudo -E debuginfo-install $(CONFIRM) glibc openssl-libs mbedtls-devel zlib
 else ifeq ($(OS_ID)-$(OS_VERSION_ID),centos-8)
 	@sudo -E dnf install $(CONFIRM) dnf-plugins-core epel-release
-	@sudo -E dnf config-manager --set-enabled PowerTools
+	@sudo -E dnf config-manager --set-enabled \
+          $(shell dnf repolist all 2>/dev/null|grep -i powertools|cut -d' ' -f1)
 	@sudo -E dnf groupinstall $(CONFIRM) $(RPM_DEPENDS_GROUPS)
 	@sudo -E dnf install $(CONFIRM) $(RPM_DEPENDS)
 else ifeq ($(OS_ID),centos)