crypto: ecc - Correct an error in the comments

mainline inclusion
from mainline-v5.13-rc1
commit 0193b32f
category: bugfix
bugzilla: 173981
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0193b32f565e14ef07ced5d6bf8986490ec8e0f1



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Remove repeated word 'bit' in comments.

Signed-off-by: Meng Yu <yumeng18@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Mingqiang Ling <lingmingqiang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>