arm: add a tiny kconfig configuration

Add a tiny kconfig configuration. Enabled only the credit scheduler.
It only carries non-default options (use make menuconfig or make
olddefconfig to produce a complete .config file).

Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Julien Grall <julien.grall@arm.com>

---
Changes in v7:
- remove NULL because it is still experimental

xen/arch/arm/configs/tiny64.conf

@@ -0,0 +1,38 @@
+CONFIG_ARM_64=y
+CONFIG_ARM=y
+
+#
+# Architecture Features
+#
+# CONFIG_GICV3 is not set
+# CONFIG_MEM_ACCESS is not set
+# CONFIG_SBSA_VUART_CONSOLE is not set
+
+#
+# Common Features
+#
+# CONFIG_TMEM is not set
+CONFIG_SCHED_CREDIT=y
+# CONFIG_SCHED_CREDIT2 is not set
+# CONFIG_SCHED_RTDS is not set
+# CONFIG_SCHED_ARINC653 is not set
+# CONFIG_SCHED_NULL is not set
+# CONFIG_SUPPRESS_DUPLICATE_SYMBOL_WARNINGS is not set
+
+#
+# Device Drivers
+#
+# CONFIG_HAS_NS16550 is not set
+# CONFIG_HAS_CADENCE_UART is not set
+# CONFIG_HAS_MVEBU is not set
+# CONFIG_HAS_PL011 is not set
+# CONFIG_HAS_SCIF is not set
+# CONFIG_ARM_SMMU is not set
+
+#
+# Debugging Options
+#
+# CONFIG_DEBUG is not set
+# CONFIG_FRAME_POINTER is not set
+# CONFIG_VERBOSE_DEBUG is not set
+# CONFIG_SCRUB_DEBUG is not set