net/pppoe: fix a typo for the PPPOE_HASH_BITS_1 definition

Instead of its intention to define PPPOE_HASH_BITS_1, commit 96ba44c637b0
("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: 96ba44c637b0 ("net/pppoe: make number of hash bits configurable")
Signed-off-by: Lukas Bulwahn <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Reviewed-by: Jaco Kroon <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Paolo Abeni <[e-mail]>

drivers/net/ppp/Kconfig

···
 
 		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