net/pppoe: fix a typo for the PPPOE_HASH_BITS_1 definition

Instead of its intention to define PPPOE_HASH_BITS_1, commit 96ba44c6
("net/pppoe: make number of hash bits configurable") actually defined
config PPPOE_HASH_BITS_2 twice in the ppp's Kconfig file due to a quick
typo with the numbers.

Fix the typo and define PPPOE_HASH_BITS_1.

Fixes: 96ba44c6 ("net/pppoe: make number of hash bits configurable")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Jaco Kroon <jaco@uls.co.za>
Link: https://lore.kernel.org/r/20230605072743.11247-1-lukas.bulwahn@gmail.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ppp/Kconfig

@@ -141,7 +141,7 @@ choice
 
 		This hash table is on a per outer ethernet interface.
 
-config PPPOE_HASH_BITS_2
+config PPPOE_HASH_BITS_1
 	bool "1 bit (2 buckets)"
 
 config PPPOE_HASH_BITS_2