server_aarch64: Add a workaround for AGY

See
https://discuss.ai.google.dev/t/bug-report-antigravity-ai-language-server-crashes-on-arm64-chromebook/110361/1
for the context.

Bug: 514819261
Test: run ferrochrome, install AGY, and run AGY
Change-Id: I37c984d7cc64242aa68368db2c78c70e1e5d8bb5
Signed-off-by: Inseob Kim <inseob@google.com>

linux_distro_aarch64.fragment

diff --git a/linux_distro_aarch64.fragment b/linux_distro_aarch64.fragment
index 764d9c6..c1f1b3e 100644
--- a/linux_distro_aarch64.fragment
+++ b/linux_distro_aarch64.fragment
@@ -1 +1,4 @@
 CONFIG_VFIO_PLATFORM=y
+
+# workaround for b/514819261
+CONFIG_ARM64_VA_BITS_48=y