[PATCH] cxl: update kernel config requirement

[luzhixing12345]

add CXL_PMEM config dependence LIBNVIDIMM

CXL_REGION config is not enabled in 5.18, and it was introduced 
into kernel in 6.0 by commit 779dd20c for dynamic provisioning of new memory 
region

Signed-off-by: luzhixing12345 <luzhixing12345@gmail.com>
---
 docs/system/devices/cxl.rst | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/docs/system/devices/cxl.rst b/docs/system/devices/cxl.rst
index 882b036f5e..ccbe47749f 100644
--- a/docs/system/devices/cxl.rst
+++ b/docs/system/devices/cxl.rst
@@ -401,9 +401,12 @@ OS management of CXL memory devices as described here.
 * CONFIG_CXL_BUS
 * CONFIG_CXL_PCI
 * CONFIG_CXL_ACPI
-* CONFIG_CXL_PMEM
+* CONFIG_CXL_PMEM(depends on LIBNVDIMM)
 * CONFIG_CXL_MEM
 * CONFIG_CXL_PORT
+
+Dynamic provisioning of new memory region since Linux 6.0
+
 * CONFIG_CXL_REGION
 
 References
-- 
2.34.1